二元导电剂对锂浆料电池性能的影响

doi:10.19799/j.cnki.2095-4239.2023.0505

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (11): 3299-3306.doi: 10.19799/j.cnki.2095-4239.2023.0505

二元导电剂对锂浆料电池性能的影响

高桂红¹(), 刘福园¹, 李珅珅¹, 巫湘坤¹^,², 刘艳侠¹^,²()

^1.郑州中科新兴产业技术研究院，河南省储能材料与过程重点实验室，河南郑州 450003
^2.中国科学院过程工程研究所，离子液体清洁过程北京重点实验室，北京 100190

收稿日期:2023-07-21 修回日期:2023-08-07 出版日期:2023-11-05 发布日期:2023-11-16
通讯作者: 刘艳侠 E-mail:1019660339@qq.com;yxliu@ipe.ac.cn
作者简介:高桂红（1985—），女，硕士，高级工程师，研究方向为储能及动力电池技术研发，E-mail：1019660339@qq.com；
基金资助:
国家重点研发计划项目(2019YFA0705600);国家自然科学基金项目(22078341);河南省重点研发计划项目(221111240100)

Effect of binary composite conductive agent on the performance of lithium slurry battery

Guihong GAO¹(), Fuyuan LIU¹, Shenshen LI¹, Xiangkun WU¹^,², Yanxia LIU¹^,²()

^1.Zhengzhou Institute of Emerging Industrial Technology, Henan Key Laboratory of Energy Storage Materials and Processes, Zhengzhou 450003, Henan, China
^2.Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2023-07-21 Revised:2023-08-07 Online:2023-11-05 Published:2023-11-16
Contact: Yanxia LIU E-mail:1019660339@qq.com;yxliu@ipe.ac.cn

摘要/Abstract

摘要：

电子传导是以悬浮液为电极的锂浆料电池性能受限的关键因素之一，本工作以碳纳米管(CNTs)、石墨烯(Gen)新型导电剂与科琴黑(KB)、卡博特炭黑(Cabot)传统导电剂不同比例混配成二元导电剂，通过电子扫描显微镜观察、浆料的沉降率、电导率、电化学阻抗谱、电化学性能测试等方法研究了二元复合导电剂对锂浆料电池性能的影响。研究结果表明：CNTs缠绕在活性颗粒的表面形成较多的导电位点，炭黑又围绕在活性颗粒及CNTs周围形成覆盖面更广导电路径，炭黑还附着在Gen表面，提高其垂直方向的导电能力，但Gen具有团聚、分散不均匀的现象；含Gen的浆料起始沉降速度低，且吸液保液能力好，沉降率长期稳定在3.10%；复合导电剂1%Cabot+0.3%CNTs的浆料电导率高达124.75 mS/cm，半电池的电化学转移阻抗仅有42 Ω，其放电比容量为171.06 mAh/g，首次充放电效率高达86.01%，循环230次后容量保持率仍有92.78%。

关键词: 二元, 复合导电剂, 锂浆料电池, 电性能

Abstract:

Electronic conduction is a key factor limiting the performance of lithium (Li) slurry batteries with suspensions as electrodes. In this study, new conductive agents, including carbon nanotubes (CNTs) and graphene (Gen), were mixed with conventional conductive agents, incorporating Ketjen black and Cabot carbon black (Cabot), in different proportions to form a novel binary conductive agent. The effects of the binary conductive agents on the performance of Li slurry batteries were investigated using methods, such as scanning electron microscopy, slurry sedimentation rate, electrical conductivity, electrochemical impedance spectroscopy, and electrochemical performance tests. The results show CNTs wrapped around the surface of active particles, forming numerous conductive sites, while carbon black surrounded the active particles and CNTs to create a conductive path with wider coverage. Furthermore, carbon black adhered to the surface of Gen, enhancing its vertical conductivity. Nonetheless, Gen exhibited agglomeration and uneven dispersion. The slurry containing Gen possesses a low initial sedimentation rate but displays good liquid absorption and retention capabilities, maintaining a stable sedimentation rate of 3.10% over a long term. The slurry with the conductive composite of 1%Cabot+0.3%CNTs presents a high electrical conductivity of 124.75 mS/cm, and the half-cell's electrochemical transfer impedance is calculated as 42 Ω. In addition, the composite presents a discharge specific capacity of 171.06 mAh/g, an initial charge-discharge efficiency as high as 86.01%, and a capacity retention of 92.78% after 230 cycles.

Key words: binary, composite conductive agent, lithium slurry battery, electrical properties

中图分类号:

TM 911

高桂红, 刘福园, 李珅珅, 巫湘坤, 刘艳侠. 二元导电剂对锂浆料电池性能的影响[J]. 储能科学与技术, 2023, 12(11): 3299-3306.

Guihong GAO, Fuyuan LIU, Shenshen LI, Xiangkun WU, Yanxia LIU. Effect of binary composite conductive agent on the performance of lithium slurry battery[J]. Energy Storage Science and Technology, 2023, 12(11): 3299-3306.

图/表 9

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No.	NCM622/%	KB/%	CNTs/%	Cabot /%	Gen/%	分散剂/%
1#	50	1	0.3	—	—	48.7
2#		—	0.3	1	—	48.7
3#		1	—	—	0.5	48.5
4#		—	—	1	0.5	48.5

电池编号	充电比容量/(mAh/g)	放电比容量/(mAh/g)	首次充放电效率/%
1#	200.01	172.09	86.04
2#	198.89	171.06	86.01
3#	177.98	149.43	83.96
4#	197.35	166.34	84.29

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二元导电剂对锂浆料电池性能的影响

Effect of binary composite conductive agent on the performance of lithium slurry battery

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